A-Level AQA Chemistry Amino acids, Proteins & DNA: Which is the structure of a zwit

Which is the structure of a zwitterion of an amino acid? A H$_2$N– CH – COO$^{-}$ H$_2$C– CH$_2$ – CH$_2$ – NH$_3^{+}$ B H$_2$N– CH – COO$^{-}$ H$_2$C– COO$^{-}$ C H$_2$N– CH – COO$^{-}$ H$_2$C– OH$_2$ D H$_2$N– CH – COO$^{-}$ H$_2$C– SH - AQA - A-Level Chemistry - Question 35 - 2021 - Paper 3

Question 35

$Which-is-the-structure-of-a-zwitterion-of-an-amino-acid?--A--H$_2$N–-CH-–-COO$^{-}$--H$_2$C–-CH$_2$-–-CH$_2$-–-NH$_3^{+}$--B--H$_2$N–-CH-–-COO$^{-}$--H$_2$C–-COO$^{-}$--C--H$_2$N–-CH-–-COO$^{-}$--H$_2$C–-OH$_2$--D--H$_2$N–-CH-–-COO$^{-}$--H$_2$C–-SH--AQA-A-Level Chemistry-Question 35-2021-Paper 3.png$

Which is the structure of a zwitterion of an amino acid? A H$_2$N– CH – COO$^{-}$ H$_2$C– CH$_2$ – CH$_2$ – NH$_3^{+}$ B H$_2$N– CH – COO$^{-}$ ... show full transcript

Worked Solution & Example Answer:Which is the structure of a zwitterion of an amino acid? A H$_2$N– CH – COO$^{-}$ H$_2$C– CH$_2$ – CH$_2$ – NH$_3^{+}$ B H$_2$N– CH – COO$^{-}$ H$_2$C– COO$^{-}$ C H$_2$N– CH – COO$^{-}$ H$_2$C– OH$_2$ D H$_2$N– CH – COO$^{-}$ H$_2$C– SH - AQA - A-Level Chemistry - Question 35 - 2021 - Paper 3

Step 1

Identify the zwitterion structure.

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Answer

The correct structure of a zwitterion of an amino acid is represented in option D:

\text{H}_2\text{N} – \text{C} – \text{COO}^{-} \text{H}_2\text{C} – \text{SH}

In a zwitterion, there is a net zero charge due to the presence of both a positively charged amine group (–NH(_3^{+})) and a negatively charged carboxylate group (–COO(^{-})). In this case, option D illustrates that condition effectively.

Identify the zwitterion structure.

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